Hydrocarbons, C4, 1,3-butadiene-free, polymd., triisobutylene fraction, hydrogenated (CAS 93685-81-5) — Citrus Base Note Fragrance Ingredient

ByThe Good Scents
Citrus · Floral

Hydrocarbons, C4, 1,3-butadiene-free, polymd., triisobutylene fraction, hydrogenated

CAS 93685-81-5

Origin
synthetic
Note
Base
IFRA
Use with awareness
Data as of: Apr 2026

What Is Hydrocarbons, C4, 1,3-butadiene-free, polymd., triisobutylene fraction, hydrogenated?

This synthetic hydrocarbon is used as a solvent and fixative in industrial fragrances and household products. It helps stabilize volatile scent compounds. While not directly noticeable in finished products, it plays a crucial role in extending fragrance longevity and controlling scent release.

Safety Profile

USE WITH AWARENESS
Generally safeUse with awarenessProfessional use
✓ Approved for fragrance use
⚠ Requires proper handling
CAS
93685-81-5
Formula
Mixture
MW
Variable
Odor Family
Citrus · Floral
Layer 1 · Enthusiast

What Does Hydrocarbons, C4, 1,3-butadiene-free, polymd., triisobutylene fraction, hydrogenated Smell Like?

This hydrocarbon fraction is nearly odorless, functioning primarily as a technical ingredient rather than an olfactive component. Its neutral profile makes it an ideal carrier and fixative base that doesn’t interfere with designed fragrance accords.

Layer 2

2D Molecular Structure

Hydrocarbons, C4, 1,3-butadiene-free, polymd., triisobutylene fraction, hydrogenated

SMILES: CCCCCCCCCCCC

Chemistry, Properties & Perfumer Guide

The Chemistry

A synthetic hydrocarbon mixture derived from hydrogenated triisobutylene fractions. Produced through polymerization of C4 hydrocarbons with careful removal of 1,3-butadiene residues. The hydrogenation process creates saturated hydrocarbon chains with improved stability and reduced reactivity compared to unsaturated precursors.

Physical & Chemical Properties

Perfumer Guide

Note Position
Base
Volatility
Very low
Blending
Technical
ApplicationTypical %RangeNotes
Functional Fragrances5-15%Up to 25%Solvent and fixative base
Household Products10-20%Up to 30%Carrier for functional scents

Classic Accords

Tip: Use as an odorless base for heavy fragrance compounds requiring extended release.

Alternatives & Comparisons

1
Hydrogenated Polyisobutene CAS 40921-43-1

Similar hydrocarbon fraction with slightly higher molecular weight, offering enhanced stability for heat-sensitive formulations.

Layer 3

Safety, Regulatory & Sustainability

⚠ Regulatory Disclaimer

General reference only. Consult current IFRA Standards Library before formulating.

IFRA Status

No IFRA restrictions apply to this material.

RIFM Assessment

Considered safe for intended use based on hydrocarbon class safety profile.

Sustainability

Synthetic production allows consistent quality without natural resource depletion. Manufacturing process focuses on minimizing volatile organic compound emissions through hydrogenation.

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References

    Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.

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    Ingredient Data Sheet

    CAS 93685-81-5

    Physical Properties

    Molecular Weight170.33 g/mol🔬 PubChem
    LogP (Octanol-Water)6.1🔬 PubChem
    Boiling Point216.3 °C🔬 EPA CompTox
    Vapor Pressure1 mmHg @ 25°C📊 OPERA
    Flash Point73.9 °C🔬 EPA CompTox
    Involatility Index0.0826💻 Calculated
    log Kp (skin permeability)0.592💻 Calculated
    SMILESCCCCCCCCCCCC🔬 PubChem

    Volatility & Performance

    Fragrance NoteTop💻 Calculated
    Volatility ClassSlow💻 Calculated
    Persistence Score0.5 / 5💻 Calculated
    Data Sources & Attribution
    Physical data: PubChem (NIH/NLM), U.S. EPA CompTox Dashboard, EPA OPERA models, RDKit. Odor & flavor: Arctander (Perfume & Flavor Chemicals), Fenaroli's Handbook of Flavor Ingredients, Leffingwell. Thresholds: van Gemert (Compilations of Odour Threshold Values). Regulatory: IFRA Standards 51st, FEMA GRAS. Trade names: Surburg (Common Fragrance & Flavor Materials). All data compiled and cross-referenced for perfumertools.com.

    Physicochemical Properties

    DTXSID: DTXSID001074799

    Physical Properties

    Molecular Weight 170.33 g/mol🔬 PubChem
    Density 0.749 g/cm^3🔬 PubChem
    Boiling Point 216.3 °C🔬 PubChem
    Flash Point 73.9 °C🔬 PubChem

    Partition & Solubility

    LogP (Octanol-Water) 6.1 Log10 unitless🔬 PubChem

    Transport Properties

    Vapor Pressure 1 mmHg🔬 PubChem

    Molecular Descriptors

    Topological Polar Surface Area 0 Ų💻 Computed
    H-Bond Donors 0 count💻 Computed
    H-Bond Acceptors 0 count💻 Computed
    Rotatable Bonds 9 count💻 Computed
    Molar Refractivity 57.52 cm^3/mol💻 Computed

    Data Sources:

    🔬 EPA Experimental data from U.S. EPA CompTox Chemicals Dashboard & CTX APIs. 📊 OPERA Predicted using EPA's OPERA QSAR models. 💻 Computed Calculated from SMILES using RDKit.

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